From d9443c7fdf756212bb52ffc934b1166038bc2ad3 Mon Sep 17 00:00:00 2001
From: Loic Guegan <manzerbredes@mailbox.org>
Date: Wed, 21 Apr 2021 12:23:54 +0200
Subject: Refactoring

---
 src/libs/stdio.cc | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 src/libs/stdio.cc

(limited to 'src/libs/stdio.cc')

diff --git a/src/libs/stdio.cc b/src/libs/stdio.cc
new file mode 100644
index 0000000..4a20c05
--- /dev/null
+++ b/src/libs/stdio.cc
@@ -0,0 +1,123 @@
+#include "stdio.hpp"
+#include "drivers/framebuffer.hpp"
+#include "math.hpp"
+#include "string.hpp"
+
+extern VIDEO_STATE VS;
+void (*__putchar)(char)=putchar;
+
+void printk(char *str,...) {
+  u64 rsi,rdx,rcx,r8,r9;
+  u64* rbp;
+  asm( "mov %%rsi, %0": "=a"(rsi));
+  asm( "mov %%rdx, %0": "=a"(rdx));
+  asm( "mov %%rcx, %0": "=a"(rcx));
+  asm( "mov %%r8, %0": "=a"(r8));
+  asm( "mov %%r9, %0": "=a"(r9));
+  asm( "mov %%rbp, %0": "=a"(rbp));
+
+  // Init informations
+  int len=strlen(str);
+  int i=0; // Pointer to the current character
+  int p=1; // Pointer to the current parameter
+
+  while (i!=len) {
+    char c=str[i];
+    // Check if special char is comming
+    if(str[i]=='%'){
+      char c2=str[i+1];
+      char c3=str[i+2];
+      // First just consider the data as a void pointer
+      u64 data;
+      switch (p) {
+      case 1:
+        data=rsi;
+        break;
+      case 2:
+        data=rdx;
+        break;
+      case 3:
+        data=rcx;
+        break;
+      case 4:
+        data=r8;
+        break;
+      case 5:
+        data=r9;
+        break;
+      default:
+        data=*(rbp+2+p-6);
+      }
+      
+      if(c2=='%'){
+        __putchar('%');
+        i++;
+      }
+      else if (c2=='d') {
+        int data_int=(int)data;
+        printi(data_int);
+        i++;
+        p++;
+      }
+      else if (c2=='s') {
+        print((char*)data);
+        i++;
+        p++;
+      }
+      else if (c2=='x') {
+        print("0x");
+        printh(data);
+        i++;
+        p++;
+      }
+      else if (c2=='l' && c3=='l') {
+        printi(data); // TODO: Print 64bit number
+        i+=2;
+        p++;
+      }
+    }
+    else{
+      __putchar(c);
+    }
+    i++;
+  }
+}
+
+void print(char *s){
+  int i=0;
+  while(s[i]!='\0'){
+    __putchar(s[i]);
+    i++;
+  }
+}
+
+void printc(char *str, VIDEO_COLORS c) {
+  VIDEO_COLORS backup = (VIDEO_COLORS)VS.fg;
+  VS.fg = c;
+  print(str);
+  VS.fg = backup;
+}
+
+void printi(int i) {
+  char str[12];
+  itoa(i, str);
+  print(str);
+}
+
+void printh(int h) {
+  char str[17];
+  itoh(h, str);
+  print(str);
+}
+void printh(int h, int size) {
+  char str[17];
+  char str2[17];
+  itoh(h, str);
+  int a = 0;
+  for (int i = min(max(16 - size, 0), 15); i < 16; i++) {
+    str2[a] = str[i];
+    a++;
+  }
+  str2[a] = '\0';
+  print(str2);
+}
-- 
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